Until the 1917 Codex Iuris Canonici was promulgated, canon law was based on Gratian's Decretum and a hodge podge of decretals, compilations, regulae iuris, etc. It was somewhat confusing.

In this environment, one of the most important works and really a nearly complete compendium of the body of canon law was Friedberg's Corpus Iuris Canonici.

I offer a PDF file of this document for download. Before I do this, let me give a few disclaimers:

1. This book was published a long time ago. Any copyright it might have is expired.
2. I have assembled the PDF file myself from publically available individual page images.
3. If, in spite of the above, somebody believes I'm violating their rights in some way, please contact me. I have no intent other than making this important work widely available for historical, canonical, and scholarly research. You may reach me by email at this address.
4. Beware this file is very big. The Corpus is nearly 800 pages and the file is nearly 300MB.

Without further ado, the file can be downloaded here.